Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5b7c7a5ce0ab0f…

MALICIOUS

PDF

77.7 KB Created: 2020-12-22 19:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5d24251810c39f8c62de9391080dd992 SHA-1: 7213cf86f90b0b88d2c3cbe0e50ab47948677a7a SHA-256: 3e5b7c7a5ce0ab0f5186174e912b14089e64c4b252ab89225cec74c151edd3a0
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Asme standards free pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to download content. The presence of an external URI pointing to 'trafftec.ru' further supports the phishing and potential payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/aws?utm_term=asme+standards++free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f88952e7ac04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5fb555fbf1028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_5fbac4d10637c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393356/normal_5fc443555cc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5fa377416e114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5fa0fdacc6cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5fa8531d239b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/73261677675.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/56501628091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5719a9-d8e5-41b5-8638-ce5ce4f731c4/where_to_download_halo_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdece01d7fbea164c2ec820/t/5fdfa3c48afbbc2717788838/1608491973131/happy_birthday_candle_cake_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/tovor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ec123f-1101-466c-8ba6-f22779e8f3e5/bimesujofuzu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 5144 bytes
SHA-256: 481864e4106bd65e819b706eb79a4058f1cc6d44d9ed5e0d6ca93a4aceb049dd
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 13456 bytes
SHA-256: 12d371912eab0a2430d2929549dd745a9f5310f71368cfe67395cb25eae39128

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